CN1136159C - Apparatus for manufacturing optical fiber preform - Google Patents

Apparatus for manufacturing optical fiber preform Download PDF

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Publication number
CN1136159C
CN1136159C CNB961216484A CN96121648A CN1136159C CN 1136159 C CN1136159 C CN 1136159C CN B961216484 A CNB961216484 A CN B961216484A CN 96121648 A CN96121648 A CN 96121648A CN 1136159 C CN1136159 C CN 1136159C
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CN
China
Prior art keywords
burner
equipment
reaktionsofen
optical fiber
core body
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Expired - Lifetime
Application number
CNB961216484A
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Chinese (zh)
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CN1160026A (en
Inventor
��β�Ѳ�
金尾昭博
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Furukawa Electric Co Ltd
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Furukawa Electric Co Ltd
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Publication of CN1160026A publication Critical patent/CN1160026A/en
Application granted granted Critical
Publication of CN1136159C publication Critical patent/CN1136159C/en
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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/012—Manufacture of preforms for drawing fibres or filaments
    • C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
    • C03B37/0144—Means for after-treatment or catching of worked reactant gases
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/012—Manufacture of preforms for drawing fibres or filaments
    • C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
    • C03B37/01413—Reactant delivery systems
    • C03B37/0142—Reactant deposition burners

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)

Abstract

An apparatus for manufacturing an optical fiber preform, comprising a reaction vessel housing a core, combustion burners each arranged such that a flame spurting port thereof is positioned within the reaction vessel so as to generate fine glass particles by a flame hydrolysis reaction, and a discharge unit including a discharge port arranged on a side of the reaction; vessel for discharging the excess fine glass particles which were not deposited on the core and the waste gas out of the reaction vessel, wherein an angle formed between an imaginary plane including the flame spurting port of one of the combustion burners and another imaginary plane including the discharge port of the discharge unit falls within a range of between 0 DEG and 40 DEG .

Description

Make the equipment of preform
The present invention relates to an equipment of making optical fiber preform.
As shown in Figure 1, the past is by CVD (chemical vaporization precipitation) method, and tiny glass particle is deposited to core surface, makes preform.Specific practice is that in the time of core body 31 rotations, the tiny glass particle that burner 32 is produced blows facing to the external ball surface of the core body 31 in the Reaktionsofen 30.As a result, the tiny glass particle that is blown just precipitates and covers the surface of core body 31, thereby forms optical fiber preform 33.Then, make optical fiber preform, so that obtain desirable transparent preform by vitrifying.
After the reaction, be not deposited in tiny glass particle on the core body 31,, be sent to the waste gas treatment equipment (not shown) by gas exhaust duct 34 with waste gas.
In traditional aforesaid device, the flame spraying mouth of burner 32 is arranged usually towards oblique upper, thus just axial and the vertical plane or a predetermined angle of burner 32.Must be pointed out that the reaction heat in groove 30 causes the airflow that makes progress in groove 30, the result is because the airflow that makes progress just makes the flame that sprays from burner 32 make progress.Tiny glass particle in the flame and the gas stream of being made up of air and flame move upward together, collision core body 31, and be deposited on the top and external annular surface of core body 31.On the other hand, unnecessary tiny glass particle and the said flow that are not deposited on the core body 31 are transmitted together, so that be discharged together by delivery pipe 34 and waste gas.
In traditional equipment, the unnecessary tiny glass particle that prevents the waste gas in the Reaktionsofen 30 and be not deposited on the core body 31 that importantly takes effective measures produces harmful effect to the tiny glass particle that is deposited on the core body.It is also important that, take effective measures, prevent from not to be deposited on unnecessary deposited fine glass particles on the core body 31 at the internal surface of Reaktionsofen 30.In order to satisfy these requirements, must by delivery pipe 34 waste gas and the unnecessary tiny glass particle that is not deposited on the core body 31 be discharged into the outside effectively.Therefore, wish delivery pipe 34 is installed on the limit on the core body 31, that one side of tiny deposited fine glass particles is faced in flame, just can be arranged closely as far as possible with core body 31 thereby manage 34 inlet mouth 35.
But, if the close excessively core body 31 of inlet mouth 35, the air-flow in the Reaktionsofen 30 is just disturbed, effectively discharging waste gas and unnecessary tiny glass particle.As a result, unnecessary tiny glass particle partly collides with the bottom of inlet mouth 35, the tiny glass particle of deposition on the bottom of inlet mouth 35.
If the deposition of tiny glass particle D increases voluntarily on the bottom of the inlet mouth 35 of delivery pipe 34, the air-flow in Reaktionsofen 30 will be disturbed, and changes the flow direction of tiny glass particle in the flame.Be that tiny glass particle can not clash into core body 31 with that on desirable position, the result just can not obtain the optical fiber preform of desired shape.
Must be pointed out that if the deposition of tiny glass particle D as shown in Figure 1 increases voluntarily, the deposition of this growth will contact with sedimentary tiny glass particle on the core body 31, the infringement optical fiber preform.
An object of the present invention is to provide a kind of equipment of making optical fiber preform, it can be discharged into the outside to waste gas and unnecessary tiny glass particle effectively, prevent that the air-flow in the Reaktionsofen is disturbed, the optical fiber preform that prevents to be deposited on the core body is damaged.
Provide the manufacturing optical fiber preform to give the equipment of moulding according to one embodiment of present invention, it comprises:
The Reaktionsofen that core body is housed;
Burner, the flame spraying mouth of each burner is arranged in the above-mentioned Reaktionsofen, so that the hydrolysis reaction by flame produces tiny glass particle; With
Discharge equipment is discharged described Reaktionsofen to the unnecessary tiny glass particle and the waste gas that are not deposited on the above-mentioned core body, wherein,
At the imaginary plane of the flame spraying mouth that comprises said burner with comprise the angle that forms between another imaginary plane of discharge outlet of above-mentioned discharge equipment, drop in 30 to 40 ° the scope.
According to another embodiment of the invention, provide an equipment of making preform, it comprises:
The Reaktionsofen that core body is housed;
A burner, its flame spraying mouth is arranged in the above-mentioned Reaktionsofen, so that the hydrolysis reaction by flame produces tiny glass particle; With
Discharge equipment, it is arranged at the side of above-mentioned Reaktionsofen, is used for the unnecessary tiny glass particle and the waste gas that do not amass on above-mentioned core body are discharged described Reaktionsofen,
Wherein, ratio D 1/ D 2Drop between 0.3 and 0.04 D 1Be the upper end of above-mentioned discharge equipment and the distance between the final optical fiber preform, D 2Be the lower end of discharge equipment and the distance between the final optical fiber preform.
Other purpose of the present invention and advantage will be described below, partly can be apparent by describing, perhaps can be understood by practice of the present invention.Objects and advantages of the present invention can be implemented and obtain by device and its combination of being specifically noted in the claims.
Accompanying drawing is the part of specification sheets, and it represents currently preferred embodiment of the present invention, and in conjunction with the top generality description and the specific descriptions of most preferred embodiment given below, explains principle of the present invention.
Fig. 1 explains the legacy equipment of making preform;
Fig. 2 is an embodiment of the present invention's equipment of making preform.
Now the equipment 10 that the present invention makes preform is described in conjunction with Fig. 2.As shown in the figure, equipment 10 comprises that 12, one of reactors are used to form the burner 14 of optical fiber core, is used to form another burner 16 and delivery pipe 18 of the covering of optical fiber.
Stretching mouth 12A who is used for stretchable porous preform 1 forms by the upper wall of Reaktionsofen 12.The diameter of stretching mouthful 12A should be as far as possible little, till optical fiber preform can be stretched.The burner 14 that is used to form core body passes the wall of Reaktionsofen 12 hermetically, thereby the flame jet 14A of burner 14 just is arranged in the Reaktionsofen 12.As shown in the figure, burner 14 is arranged to such an extent that make flame spraying mouth 14A towards oblique upper.
On the other hand, be used to form the burner 16 of covering, also pass the wall of Reaktionsofen 12 hermetically, thereby the flammenwerfer 16A of burner 16 is arranged in the Reaktionsofen 16.Burner 16 and burner 14 are arranged side by side, thereby flame spraying mouth 16A also allows towards oblique upper.In addition, the burner 16 that is used to form a covering is arranged at the one predetermined distance place, top of the burner 14 that forms core body.
The discharge outlet 18A of delivery pipe 18 is arranged in the Reaktionsofen 12.As shown in Figure 2, discharge outlet 18A can face oblique below.
Comprise the angle α between the imaginary plane of flame spraying mouth 14A of the burner 14 that is used to form core body at the imaginary plane that comprises discharge outlet 18A and another, be set between 0 to 40 ° that this is to consider waste gas interference in Reaktionsofen etc. and determine.Point out in passing, angle α=0 ° expression, the imaginary plane that comprises row's mouth 18A of delivery pipe 18 is parallel with the imaginary plane of the flame spraying mouth 14A that comprises core body burner 14.Occur angle α=0 ° later on, also do same interpretation.In other words, at the imaginary plane that comprises discharge outlet 18A with comprise between the imaginary plane of flame spraying mouth 16A of burner and can define an angle α.This that is to say that the flame spraying mouth 14A of burner 14,16,16A are arranged to above-mentioned so also just enough.In other words, the shape of burner concrete regulation not.For example, burner 14,16 can be bent, and up to flame jet 14A, 16A is arranged to the appearance shown in Fig. 2.
Should be noted that the distance D between the outside surface of finished product of the upper end of discharge outlet 18A and optical fiber preform 1 1, and the distance D between the outside surface of the finished product of the lower end of discharge outlet 18A and optical fiber preform 2Wish D 1/ D 2Be between 0.3 and 0.04, be damaged to prevent the prefabricated rods that forms sedimentary tiny glass particle.In order to satisfy these conditions, the angle β between imaginary plane that comprises discharge outlet 18A and vertical plane should be 25 ° ± 20 °.
If β is too little at the angle, the disturbance of the air-flow in just can not inhibited reaction stove 12, the tiny glass particle of result just is deposited on the bottom of the discharge outlet 18A in the Reaktionsofen 12.Should be noted that this deposition of tiny glass particle, may go up sedimentary optical fiber preform 1 with core body 20 (start-up portion) and contact.On the other hand, if β is excessive, waste gas and be not deposited on the outside that tiny glass particle on the core body is discharged into Reaktionsofen 12 and will have any problem.Generally speaking, the β angle wishes it is 25 ° ± 20 °.Point out that in passing Ding Yi β angle represents to comprise that the imaginary plane of the discharge outlet 18A of delivery pipe 18 is to contact with the top of core body 20 like this.
The equipment of said structure may produce significant effect.Particularly when tiny glass particle was deposited on the core body 20, the upwards airflow flowing of coming from the bottom of Reaktionsofen 12 can not collided the bottom of discharge outlet 18A.As a result, be not deposited on the outside that tiny glass particle on the core body and waste gas are discharged into Reaktionsofen 12, thereby might prevent that gas stream is interfered.Be noted that because the bottom of discharge outlet 18A is arranged away from burner, or the flame that sprays away from burner, the tiny glass particle in flame is with regard to the unlikely bottom that is deposited on delivery pipe 18A.So porous preform has just been avoided the infringement that caused by the tiny glass particle on the bottom that is deposited on discharge outlet 18A.
Equipment 10 constitutes as stated above, and it is used to make optical fiber preform 1, and then, it changes into preform again, and is as described below.The first step, the top of core body 20 are arranged a predetermined position of row swivel arrangement (not shown).Then, in the time of rotary core 20, gaseous state glass raw material and adulterated starting material and burner gas are introduced into core body burner 14 together.These raw-material mixtures are from flame spraying mouth 14A ejection, so that burn with burning gas.Be noted that the hydrolysis reaction of flame, be to carry out in the synthetic flame between glass raw material and doping starting material, thereby form tiny glass particle.Tiny glass particle is formed on the top and the outer ring surface of core body 20, so that form a porous preform that is used for core body.
Next step, the glass raw material and the doping starting material that be converted to covering are sent to covering burner 16, covering burner and combustion gases be arranged at together core body burner 14 above.Then, the mixture of frit and doped raw material is from flame spraying mouth 16A ejection, so that burned gas firing.As a result, flame hydrolysis is just carried out in the synthetic flame between glass raw material and doped raw material, so that form tiny glass particle.The synthetic tiny glass particle that is used for clad is deposited on the external peripheral surface of the optical fiber preform of the core body that above-mentioned steps forms, thereby produces the optical fiber preform that comprises core body and covering.
Should be understood that, the tiny glass particle that is not deposited on the core body 20 or is not deposited on the outer round surface of optical fiber preform 1 is sucked into delivery pipe 18 together by the waste gas that discharging mouth of pipe 18A and flame hydrolysis produce, and removes (not shown) so that be discharged in the waste gas treatment equipment that is arranged in Reaktionsofen 12 outsides.
In the embodiment shown in Figure 2, the axle of delivery pipe 18 is that horizontal direction is extended arrangement.Simultaneously, cut sth. askew in the end that is arranged in the pipe 18 in the Reaktionsofen 12, forms discharge outlet 18A, comprises that like this imaginary plane of discharge outlet 18A just tilts 25 ° from vertical plane.In other words, the distance D between the lower end of the outer circle surface of optical fiber preform 1 and discharge outlet 18A 2Greater than the distance D between the upper end of the outer circle surface of optical fiber preform 1 and discharge outlet 18A 1Alternatively, delivery pipe 18 its ends of not cut sth. askew can become 25 ° to arrange obliquely with horizontal plane, in this case, comprise that the imaginary plane of discharge outlet 18A just tilts about 25 ° to vertical plane.Then, undesirable waste gas and not as wish the tiny glass particle that is deposited is discharged into the outside of Reaktionsofen 12, shown in Fig. 2 embodiment.
Optical fiber preform is actually by device fabrication shown in Figure 2, the result, and the appearance of the defective prefabricated rods that is caused by the tiny deposited fine glass particles of the bottom that is deposited on delivery pipe 18A reduces about 97% than the situation with the legacy equipment among Fig. 1.
As mentioned above, the equipment that the present invention makes preform comprises a delivery pipe, and the discharge outlet of pipe is arranged at the opposite of burner one side.And, comprise that the relative vertical plane of imaginary plane of the discharge outlet of delivery pipe tilts 25 ° ± 20 °, thereby compare that the bottom of discharge outlet retreats with the upper end.This special structure is for preventing that the bottom from the upwards airflow flowing bump discharge outlet of the bottom of Reaktionsofen from being that effectively air-flow successfully is discharged to the outside of Reaktionsofen as a result.So the air-flow in Reaktionsofen has just been avoided interference.Should be pointed out that the tiny glass particle in the flame just can not be deposited on the bottom of discharge outlet because the bottom of discharge outlet is arranged enough far from flame.As a result, porous preform has just been avoided the infringement that caused by the tiny glass particle on the bottom that is deposited on discharge outlet.Certainly, undesirable waste gas with do not have deposit to become the tiny glass particle of porous preform, can successfully be discharged into the outside of Reaktionsofen 12, this be because the upper end of the discharge outlet 18A of delivery pipe be arranged with prior art in the same.

Claims (4)

1. equipment of making preform (1) comprises:
The Reaktionsofen (12) that a core body (20) is housed
Burner (14,16), (14A 16A) is arranged in the described Reaktionsofen (12) its flame spraying mouth, so that produce tiny glass particle by flame hydrolysis; With
Discharge equipment (18) is arranged in the side of described Reaktionsofen (12), is used for unnecessary tiny glass particle and the waste gas of going up deposit at described core body (20) are not discharged described Reaktionsofen (12),
It is characterized in that, comprising described burner (14,16) (14A, imaginary plane 16A) and another comprise that corner between the imaginary plane of a discharge outlet (18A) of described discharge equipment is within 0 ° to 40 ° scope to one of described flame spraying mouth; And
25 ° ± 20 ° angles of the relative vertical plane inclination of imaginary plane that comprise the discharge outlet (18A) of described discharge equipment (18).
2. according to the equipment of claim 1, it is characterized in that ratio D 1/ D 2Drop in the scope between 0.3 and 0.04, wherein D 1Be the upper end of described discharge equipment (18) and the distance between the final optical fiber preform, D 2Be the lower end of discharge equipment (18) and the distance between the final optical fiber preform.
3. according to the equipment of claim 1, it is characterized in that described burner (14,16) comprises that a burner that is used to form an optical fiber core is used to form the burner of fibre cladding with another.
4. according to the equipment of claim 1, it is characterized in that, comprise that an imaginary plane of a discharge outlet (18A) of described discharge equipment (18) becomes 25 ° ± 20 ° inclinations with vertical plane.
CNB961216484A 1995-11-07 1996-11-06 Apparatus for manufacturing optical fiber preform Expired - Lifetime CN1136159C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP288218/1995 1995-11-07
JP28821895A JP3485697B2 (en) 1995-11-07 1995-11-07 Optical fiber preform manufacturing equipment
JP288218/95 1995-11-07

Publications (2)

Publication Number Publication Date
CN1160026A CN1160026A (en) 1997-09-24
CN1136159C true CN1136159C (en) 2004-01-28

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CNB961216484A Expired - Lifetime CN1136159C (en) 1995-11-07 1996-11-06 Apparatus for manufacturing optical fiber preform

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JP (1) JP3485697B2 (en)
CN (1) CN1136159C (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003335541A (en) * 2002-03-13 2003-11-25 Fujikura Ltd Method for manufacturing porous preform
CN1327039C (en) * 2004-02-06 2007-07-18 赵开方 Technology for treating electroplating effluent by biochemical process
CN109020185B (en) * 2018-08-03 2021-05-28 长飞光纤光缆股份有限公司 Method for preparing microstructure optical fiber prefabricated rod

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5637179A (en) * 1979-09-04 1981-04-10 Mitsubishi Electric Corp Heat-sensitive recording system
US4435199A (en) * 1982-04-26 1984-03-06 Western Electric Co., Inc. Exhaust system for a vapor deposition chamber
DE3304552A1 (en) * 1983-02-10 1984-08-16 Standard Elektrik Lorenz Ag, 7000 Stuttgart METHOD FOR PRODUCING LIGHTWAVE GUIDES
JPS60215540A (en) * 1984-04-06 1985-10-28 Sumitomo Electric Ind Ltd Production unit for porous parent material of optical fiber
JPS6120492A (en) * 1984-07-06 1986-01-29 Matsushita Electric Ind Co Ltd Non-directivity microphone
JPH0776097B2 (en) * 1987-01-20 1995-08-16 日本電信電話株式会社 Glass film manufacturing equipment
JPS63242940A (en) * 1987-03-31 1988-10-07 Tatsuta Electric Wire & Cable Co Ltd Production of porous preform for optical fiber
JPH02164735A (en) * 1988-12-20 1990-06-25 Furukawa Electric Co Ltd:The Quartz glass soot production device
JPH02283632A (en) * 1989-04-21 1990-11-21 Fujikura Ltd Deposition apparatus for fine glass particle
US5211732A (en) * 1990-09-20 1993-05-18 Corning Incorporated Method for forming a porous glass preform
JPH0570168A (en) * 1991-09-13 1993-03-23 Fujikura Ltd Apparatus for producing optical fiber preform
JPH06316422A (en) * 1993-04-30 1994-11-15 Fujikura Ltd Producing device for glass preform

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Publication number Publication date
US5879428A (en) 1999-03-09
JP3485697B2 (en) 2004-01-13
CN1160026A (en) 1997-09-24
JPH09132422A (en) 1997-05-20

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